iOS bandpass filter

2
votes

I'm developing an iPhone application using the Audio Unit to perform a bandpass filter. The iOS bandpass filter API needs two parameters: center frequency (in Hz) and bandwidth (in cents with ranges from 100 to 12000). But I do not understand what is cents? How to translate cents into frequency?

For example if I want to perform a filter to pass frequency from 500 to 8000. What center frequency and bandwidth should I use?

Thanks for the help. Any explanation would be really helpful!

1
iphoneiosaudiosignal-processingcore-audio

1 Answers

3
votes

Cents are a logarithmic unit of measure for music intervals. You can find a converter from Cents to frequency ratios here. There is also quite a bit of information on google if you search for Audio Cents to Frequency. Hope that Helps!